These functions are used to specify months from previous years for
the design matrix. .(1)
is the same as -1
, and
specifies previous year's January, whereas ..(1)
signifies
January of the year prior to the last year.
1 2 3 | .(x)
..(x)
|
x |
numeric identifier (of length 1) for the months (1 for January, ..., 12 for December) |
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